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- This package allows users to package python modules without creating package
- Makefiles for each individual module and their dependencies. It provides a
- way making packaging python packages faster and may also facilitate the process
- of developing Makefiles for new python packages
-
- This is a raw DEVEL only package. Using it may entail a lot of implementation
- details and you may need to resolve target dependencies and package details on
- your own
-
- - Third party python packages may depend on features not included in e.g.
- python-light
- - Some python modules may require host install of another module to progress,
- e.g. target cryptography requires host cffi
- - Some python modules have external C library dependencies, e.g. pyOpenSSL
- requires openssl libs
- - Some packages may have an autoconf configure script whose arguments we
- cannot control with pip and has to be passed on (hacked) by overriding some
- environment variables
-
- ## How it works
-
- 1. Install host modules required for building target modules
- 2. Install each target module to separate directories
- 3. Install another copy of modules for cleanup purposes to make list of
- installed files to be removed from target modules installed in step 2
-
- Why should it be so
-
- 1. Installing target cryptography requires host installation of cffi module
- 2. cryptography requires setuptools and pip will install its own copy with
- --ignore-installed. When PACKAGE_python-setuptools is also selected, opkg
- will complain of data file clashes if it was not removed here.
-
- Pip will handle dependency requirements of python modules, but external
- dependencies like c libraries has to be prepared by the build system. The
- issue is that there is currently no way to express such dependencies, thus may
- cause build failure, e.g. pycrypto requires the presence of libgmp to build
- successfully.
-
- ## Tips
-
- If something goes wrong, we can add additional arguments to pip command
- line to check the detailed build process. Some useful arguments may be
-
- - -v, for verbose output. Repeat this option if the current level of
- verbosity is not enough
- - --no-clean, for preserving pip build dir on build failure
-
- ## Examples
-
- tornado (python-only module)
-
- CONFIG_PACKAGE_python-packages=y
- CONFIG_PACKAGE_python-packages-list="tornado==4.4.2"
-
- cryptography (requires installation of host modules and cleanup on target modules)
-
- CONFIG_PACKAGE_python-packages=y
- CONFIG_PACKAGE_python-packages-list-host="cffi"
- CONFIG_PACKAGE_python-packages-list="cryptography"
- CONFIG_PACKAGE_python-packages-list-cleanup="setuptools"
-
- pycrypto 2.7a1 (python module with autoconf configure script; depends on
- libgmp; broken wmmintrin.h). 2.6.1 does not work because of a flaw in
- the setup.py hardcoding host include directory
-
- CONFIG_PACKAGE_libgmp=y
- CONFIG_PACKAGE_python-packages=y
- CONFIG_PACKAGE_python-packages-list="https://github.com/dlitz/pycrypto/archive/v2.7a1.tar.gz"
- CONFIG_PACKAGE_python-packages-envs="ac_cv_header_wmmintrin_h=no build_alias=$(GNU_HOST_NAME) host_alias=$(GNU_TARGET_NAME) target_alias=$(GNU_TARGET_NAME)"
- CONFIG_PACKAGE_python-packages-extra-deps="libgmp.so.10"
-
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